package cn.tedu.sp06.filter;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;

@Component
public class AccessFilter extends ZuulFilter {

    //设置过滤器的类型： pre  routing  post  error
    @Override
    public String filterType() {
        //return "pre";
        return FilterConstants.PRE_TYPE;
    }
    //位置序号
    @Override
    public int filterOrder() {
        return 6;
    }
    //判断针对当前请求，是否执行过滤代码
    @Override
    public boolean shouldFilter() {
        /*
        * 调用商品判断权限
        * 调用用户和订单，不检查权限
        * */
        //获得调用的服务的id
        RequestContext ctx = RequestContext.getCurrentContext();//键值对
        String serviceId = (String) ctx.get(FilterConstants.SERVICE_ID_KEY);
        return "item-service".equals(serviceId);
    }
    //过滤代码
    @Override
    public Object run() throws ZuulException {
        //获得request对象
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        //接收token参数
        String token = request.getParameter("token");
        //若没有token，阻止继续访问，直接返回响应
        //if(token==null || token.length()==0 || token.trim().length()==0){}
        if(StringUtils.isBlank(token)){
            //组织继续访问
            ctx.setSendZuulResponse(false);
            //直接返回响应
            ctx.addZuulResponseHeader("Content-Type", "text/html;charset=UTF-8");
            ctx.setResponseBody("Not Login! 未登录!");
        }
        //返回值不起任何作用
        return null;
    }
}
